Description
Control Unit For Parking Assist For Citroën And Peugeot Vehicles
This parking assist ECU is a direct-fit electronic control unit designed for Citroën and Peugeot models. Ideal for professional workshops and DIY mechanics, this unit (part numbers 9629825380, 659078, 601746, NFP) manages ultrasonic parking sensors and the associated warning logic to help drivers maneuver safely. Replacing a faulty parking assist ECU restores sensor processing, audible/visual alerts and CAN-bus communication related to parking aids.
Key Features And Benefits
High-value replacement for vehicles equipped with factory parking sensors. The unit interprets sensor signals, filters false triggers and issues accurate distance warnings to the driver. Compatible with original electrical connectors and mounting points to ensure secure installation and reliable operation. Commonly sought under reference numbers 9629825380 and 659078 — include these codes when searching for compatibility.
Fitment And Compatible Models
Typical applications include Citroën C5, Citroën C8 and Peugeot 807. Always verify the listed product codes against the part required for your specific vehicle generation and equipment level.
What The Unit Does
The parking assist control unit processes inputs from ultrasonic sensors, assesses obstacle distance, and sends output signals to dashboard indicators, audible buzzers, and, where fitted, visual displays. It communicates with the vehicle network (CAN) to coordinate with other driver-assistance systems and to store sensor diagnostics.
Typical Failure Modes And Causes
- Water Ingress Or Corrosion: Moisture entering connectors or the unit housing can cause intermittent faults or permanent failure.
- Physical Damage: Impact to sensors or wiring can create erroneous signals leading to ECU error states.
- Electrical Surges Or Short Circuits: Faulty wiring, after-market installations, or jump-start events may damage internal electronics.
- Connector Oxidation And Poor Contacts: Corroded pins result in communication errors between sensors and the ECU.
Replacement Procedure (General Guidance)
- Safety First: Disconnect the vehicle battery before starting to avoid short circuits and protect sensitive electronics.
- Locate Unit: Access the parking assist ECU following the vehicle manufacturer’s service manual — common locations include under the dashboard, in the trunk area, or behind trim panels.
- Disconnect Connectors: Carefully release locking tabs and remove electrical connectors. Inspect connectors and wiring for corrosion or damage.
- Remove Mounting Fasteners: Unbolt the unit and remove it from its bracket or housing.
- Install New Unit: Mount the replacement unit, reconnect all connectors securely and reassemble trim.
- Power-Up And Check: Reconnect the battery, clear stored fault codes, and perform a functional check of sensors and warnings.
Recommended Workshop Tips
- Perform A Full Sensor Check: Test each ultrasonic sensor for correct operation before condemning the ECU — a failed sensor can mimic ECU faults.
- Inspect Wiring Harness And Grounds: Repair any damaged wires or corroded grounds to prevent recurring failures.
- Fault Code Scan: Use a professional diagnostic tool to read parking assist fault codes and live sensor data during testing.
- Secure Mounting And Sealing: Ensure the unit and its connectors are properly sealed against moisture and vibration.
Technical Information
Manufacturer: Stellantis
Model: Citroën C5; Citroën C8; Peugeot 807
Product Codes: 9629825380; 659078; 601746; NFP
Other Numbers: 659078; 9629825380
Why This Part Is Frequently Replaced
Parking assist ECUs are commonly replaced when sensors report inconsistent distances, multiple sensor faults appear simultaneously, or the system ceases to provide acoustic/visual warnings. Environmental exposure (moisture, road salt), connector corrosion and prior impact damage are the most frequent root causes.
Installation Recommendation
For reliable commissioning and diagnosis use professional diagnostic equipment capable of reading parking-sensor data and clearing related fault codes. When in doubt, have the unit fitted by an experienced technician to ensure correct mounting, wiring integrity and system calibration.
